Question

There are 20 coins in a jar each coin is either a nickel or a quarter. If one of the coins is selected at random the probability of selecting a nickel is 0.6. How many quarters are in the jar

Answer 1

Step-by-step explanation:

Let the number of nickel coins be 'x'

Total coins=20

Hence the probability of drawing a nickel coin will be,

x/20...(1)

But it is given that the probability of drawing a nickel coin is 0.6...(2)

Equating (1) and (2) we get,

x/20=0.6

Hence,

x=20*0.6

This gives us the solution that x is equal to 12

If the number of nickel coins is equal to 12,then the number of quarters is equal to,

Total no. if coins - nickels

20-12=8

Hence no. of quarters is 8